From the New York Times:
Nationally… more than one third of mortgage holders — 37 percent, up from 35 percent in 2005, or a rise of more than 1.5 million households — spent at least 30 percent of their gross income on housing costs, the level many government agencies consider the limit of affordability.
“Maybe it all means that housing is not as smart an investment for as many people as we thought,” said Matt Fellowes, a scholar in metropolitan policy at the Brookings Institution. “Stocks perform better than houses over time. Maybe the American dream should be building wealth in general, not building a certain type of wealth, which we see is narrow and dangerous.”